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Development of the permanent magnet synchronous motor with optimal rotor construction

开发具有优化转子结构的永磁同步电机

基本信息

批准号：
09650332
负责人：
ONUKI Takashi
金额：
$ 1.22万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650332/
关键词：
Rotor construction PMSM PWM Space harmonics Damping effect Hybrid FE-BE method Electric circuit Motion equation 同期モータ回転モータ永久磁石電磁界数値解析

项目摘要

The purpose of this paper is to derive an optimal rotor construction in the permanent magnet synchronous motor (PMSM). While the field system of PMSM has generally a single magnet for a mainpole, we replace the magnet into plural sub-magnets having same polarity instead of the single one. The dimensions and arrangements of each sub-magnet are based on the concept of pulse width modulation (PWM). By adopting the proposed sub-magnet scheme, we can not only reduce the undesirable higher space harmonics of the air-gap field in electric machinery but also provide space for damper winding between neighboring sub-magnets. From the investigation by hybrid FE-BE (coupled finite element and boundary element) method and experiment, we presented that the proposed construction is effective for practical use in view of the followings : the magnitude of fundamental in air-gap flux distribution, the ratio of higher space harmonics to the fundamental component, the feasibility of manufacture, the hunting oscillations, and the induction starting.The obtained results by analysis and experiment are as follows.1. The more number of sub-magnets produces the less space harmonics and the higher damping effects. The reduction of air-gap flux by magnet division can be supplemented by adopting the high grade of rare-earth one.2. The damping effects are much influenced by whole amount of rotor bars.3. By applying both electric circuit and motion equation to the hybrid FE-BE method, the precision of analysis could be improved.From the above advantages, we conclude that six-divided type is the most desirable construction among the investigated types. However, considering the difficulties of manufacture, we also propose that four-divided type is effective for practical use.

本文的目的是推导出永磁同步电机（PMSM）中的最佳转子结构。虽然PMSM的磁场系统通常具有单个磁体作为主极，但我们将磁体替换为多个具有相同极性的子磁体而不是单个磁体。每个子磁体的尺寸和布置均基于脉冲宽度调制 (PWM) 的概念。通过采用所提出的子磁体方案，我们不仅可以减少电机中气隙场的不良高空间谐波，而且可以为相邻子磁体之间的阻尼绕组提供空间。通过混合FE-BE（有限元和边界元耦合）方法和实验的研究，我们从气隙磁链分布的基波幅值、空间高次谐波与基波分量的比例、制造的可行性、振荡振荡和感应启动等方面，证明了所提出的结构在实际应用中是有效的。分析和实验得到的结果如下： 1．子磁体数量越多，产生的空间谐波越少，阻尼效果越高。分磁对气隙磁通的减少可以通过采用高品位稀土一来补充。2．阻尼效果受转子导条总量影响较大。 3．将电路和运动方程同时应用到混合FE-BE方法中，可以提高分析的精度。从以上优点，我们得出结论，六分割型是所研究类型中最理想的结构。但考虑到制造的困难，我们也提出四分式对于实际应用来说是有效的。